Re: [Qemu-devel] [PATCH for-1.5 4/4] virtio-scsi: fix the command line compatibility.

[Paolo Bonzini <pbonzini@redhat.com>]

Il 29/04/2013 17:12, fred.konrad@greensocs.com ha scritto:
> From: KONRAD Frederic <fred.konrad@greensocs.com>
> 
> The bus name is wrong since the refactoring.
> 
> This keep the behaviour of the command line.
> 
> Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
> ---
>  hw/s390x/s390-virtio-bus.c      |  9 +++++++++
>  hw/s390x/virtio-ccw.c           |  9 +++++++++
>  hw/scsi/virtio-scsi.c           | 14 +++++++++++++-
>  hw/virtio/virtio-pci.c          |  9 +++++++++
>  include/hw/virtio/virtio-scsi.h |  7 +++++++
>  5 files changed, 47 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
> index 6620d29..e1fd937 100644
> --- a/hw/s390x/s390-virtio-bus.c
> +++ b/hw/s390x/s390-virtio-bus.c
> @@ -232,6 +232,15 @@ static int s390_virtio_scsi_init(VirtIOS390Device *s390_dev)
>  {
>      VirtIOSCSIS390 *dev = VIRTIO_SCSI_S390(s390_dev);
>      DeviceState *vdev = DEVICE(&dev->vdev);
> +    DeviceState *qdev = DEVICE(s390_dev);
> +
> +    /*
> +     * For command line compatibility, this set the virtio-scsi-device bus
> +     * name as before.
> +     */
> +    if (qdev->id) {
> +        set_virtio_scsi_bus_name(vdev, qdev->id);
> +    }

Could this be simply a qdev property?

Consider that qdev will strdup any bus name you pass, so it is perfectly
ok to do:

   bus_name = g_strdup_printf("%s.0", vs->bus_name);
   scsi_bus_new(..., bus_name);
   g_free(bus_name);

> +void set_virtio_scsi_bus_name(DeviceState *dev, const char *bus_name)
> +{
> +    VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
> +    if (bus_name) {
> +        vs->bus_name = g_malloc(strlen(bus_name) + 3);
> +        snprintf(vs->bus_name, strlen(bus_name) + 3, "%s.0", bus_name);

This would use g_strdup_printf, as above.

Paolo

> +    }
> +}
> +
>  int virtio_scsi_common_init(VirtIOSCSICommon *s)
>  {
>      VirtIODevice *vdev = VIRTIO_DEVICE(s);
> @@ -624,7 +633,7 @@ static int virtio_scsi_device_init(VirtIODevice *vdev)
>          return ret;
>      }
>  
> -    scsi_bus_new(&s->bus, qdev, &virtio_scsi_scsi_info);
> +    scsi_named_bus_new(&s->bus, qdev, &virtio_scsi_scsi_info, vs->bus_name);
>      if (!qdev->hotplugged) {
>          scsi_bus_legacy_handle_cmdline(&s->bus);
>      }
> @@ -639,6 +648,9 @@ int virtio_scsi_common_exit(VirtIOSCSICommon *vs)
>  {
>      VirtIODevice *vdev = VIRTIO_DEVICE(vs);
>  
> +    if (vs->bus_name) {
> +        g_free(vs->bus_name);
> +    }
>      g_free(vs->cmd_vqs);
>      virtio_cleanup(vdev);
>      return 0;
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 598876f..14fb8dd 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1106,11 +1106,20 @@ static int virtio_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
>      VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
>      DeviceState *vdev = DEVICE(&dev->vdev);
>      VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
> +    DeviceState *proxy = DEVICE(vpci_dev);
>  
>      if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
>          vpci_dev->nvectors = vs->conf.num_queues + 3;
>      }
>  
> +    /*
> +     * For command line compatibility, this set the virtio-scsi-device bus
> +     * name as before.
> +     */
> +    if (proxy->id) {
> +        set_virtio_scsi_bus_name(vdev, proxy->id);
> +    }
> +
>      qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
>      if (qdev_init(vdev) < 0) {
>          return -1;
> diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
> index 4db346b..c356d54 100644
> --- a/include/hw/virtio/virtio-scsi.h
> +++ b/include/hw/virtio/virtio-scsi.h
> @@ -164,6 +164,9 @@ typedef struct VirtIOSCSICommon {
>      VirtQueue *ctrl_vq;
>      VirtQueue *event_vq;
>      VirtQueue **cmd_vqs;
> +
> +    /* bus_name, for command line compatibility */
> +    char *bus_name;
>  } VirtIOSCSICommon;
>  
>  typedef struct {
> @@ -189,5 +192,9 @@ typedef struct {
>  int virtio_scsi_common_init(VirtIOSCSICommon *vs);
>  int virtio_scsi_common_exit(VirtIOSCSICommon *vs);
>  
> +/*
> + * For command line back compatibility, set the bus name before initialisation.
> + */
> +void set_virtio_scsi_bus_name(DeviceState *dev, const char *bus_name);
>  
>  #endif /* _QEMU_VIRTIO_SCSI_H */
>